Prevalence Estimates Of Mental Disorders Research Articles

Stability of mental disorder prevalence estimates among school-aged children and adolescents: findings from the community-based project to learn about youth-mental health (PLAY-MH) and replication-PLAY-MH (Re-PLAY-MH), 2014–2017

PurposeThis study evaluated the stability over time of prevalence estimates of mental disorders among school-aged children from the same community. MethodsWe compared screening status and weighted prevalence of selected mental disorders from the two-stage school-based South Carolina Project to Learn About Youth-Mental Health (Time 1) and its replication study (Time 2) conducted between 2014 and 2017. During stage 1, two teacher screeners were used to group students into high or low risk for a mental disorder. During stage 2, parents of selected students completed a structured diagnostic interview to assess whether their child met criteria for specific disorders. ResultsFor stage 1, 19.9% of students screened as high risk for a mental disorder at Time 2 compared to 17.8% at Time 1. Among students included at both timepoints, 9.1% screened as high risk at both timepoints while screening status changed for 20.7%. The overall prevalence of included mental disorders was approximately 18% at both time points There were no differences (P-values >.05) in prevalence of individual mental disorders between Time 1 (range:0.3%–6.7%) and Time 2 (range:1.2%–7.7%). ConclusionsStudy findings demonstrate that similar methodology yielded similar prevalence estimates of mental disorders and can inform community-level planning for improving mental health in children.

Prevalence of mental disorders in prisons in the UK: a systematic review and meta-analysis

AimsTo report pooled prevalence of all mental disorders among the general prison population in the United Kingdom (UK). This includes individuals in Young Offender Institutions (YOI), youth custody and adult prisons across all categories. A secondary aim explores possible sources of heterogeneity by performing subgroup and meta-regression analysis across certain covariates (e.g. sex of prisoner). We hypothesise that contemporary estimates of mental disorders are higher than the general population.BackgroundPrevalence of mental health problems among prisoners are considerably higher than the general population; this poses an important public health concern. Individuals who require diversion to appropriate psychiatric services are becoming embroiled in the revolving door of the criminal justice system. However, there are no up-to-date reviews assessing prevalence of mental disorders across the general prison population in the UK. This study aims to address this gap.MethodWe conducted a systematic search of PsycINFO (1923 – October 2019), MEDLINE (1946 – October 2019), EMBASE (1947 – October 2019) and Web of Science (all years) of articles reporting prevalence of mental disorders in UK prison populations (PROSPERO registration number: CRD42019132685). The Joanna Briggs Institute (JBI) Appraisal Checklist for Studies Reporting Prevalence Data assessed study quality and bias. Pooled prevalence of each mental disorder was calculated using Stata statistical software 16.0 via the metaprop command. Forest plots present prevalence estimates with study weights and associated 95% confidence intervals (CI). Overall, 20 studies satisfied inclusion criteria, comprising of 12,335 prisoners across England, Wales and Scotland.ResultWe identified higher rates of neurotic disorders (28.9%, 95% CI 0.71–74.7%), personality disorders (23.5%, 95% CI 13.6–35.2%), alcohol (22.7%, 95% CI 12.2–35.1%) and drug dependence (26.7%, 95% CI 15.0–40.4%). The lowest prevalence rates included schizophrenia (2.42%, 95% CI 0.78–4.84%), panic disorders (3.88%, 95% CI 3.17% – 4.64%), adjustment disorders (3.83%, 95% CI 1.19–7.84%) and intellectual disability (2.90%, 95% CI 0.90–5.80%). Meta-regressions for psychotic disorder and personality disorder revealed no significant differences across study year, sample size and gender.ConclusionOur prevalence estimates of mental disorders in prisons are higher than the general English population. However, we should acknowledge the influence of considerable heterogeneity. These findings demonstrate the need to quantify current prevalence of mental disorders amongst prisoners in the UK. We recommend for the government to consider performing an up-to-date census of psychiatric morbidity to facilitate service provision.

Association of response rate and prevalence estimates of common mental disorders across 129 areas in a nationally representative survey of adults in Japan.

To investigate the association of area response rate with prevalence estimates of mental disorders in the 2nd World Mental Health Survey (WMHJ2). The sample of the WMHJ2 was selected from community residents in 129 areas from three regions of Japan. The surveys were conducted between 2013 and 2015, and 2450 (43.4%) responded. Mental disorders as well as three disorder classes (mood, anxiety, and substance use disorders) were identified using the WHO CIDI/DSM-IV. Response rates and 12-month and lifetime prevalences were calculated for each area. A generalized linear mixed model analysis was conducted to associate area response rate with the prevalence of mental disorders, controlling for sex, age, urbanity, and geographical region. Area response rates ranged from 0.05 to 0.80 across the 129 areas. Area response rate was not significantly associated with 12-month or lifetime prevalence of mental disorder. Lifetime prevalences of substance use disorder were significantly lower in a survey with a higher response rate than a survey of the same area with a lower response rate. Response rate may not strongly affect the prevalence estimates of mental disorders in a community-based survey of the prevalence of common mental disorders during a particular time frame. However, a lower response rate could be associated with overestimation of lifetime prevalence of substance use disorder. This needs further elucidation.

Scaling up mental health interventions in conflict zones

Scaling up mental health interventions in conflict zones

Research round-up

In a systematic review and meta-analysis, Fiona Charlson and colleagues have updated WHO prevalence estimates for mental disorders in populations affected by conflict. 129 studies comprising data from 39 countries for populations affected by conflict less than 10 years previously were included in the study, with five mental disorders included in the analysis (depression, anxiety, post-traumatic stress disorder, bipolar disorder, and schizophrenia). Overall, the estimated point prevalence of mental disorders was 22·1% (95% UI 18·8–25·7) in conflict-affected settings. The estimated point prevalence of severe mental disorders was 5·1% (95% UI 4·0–6·5) and moderate disorders was 4·0% (2·9–5·5). The authors highlighted that their estimates were higher than previously published values. New WHO prevalence estimates of mental disorders in conflict settings: a systematic review and meta-analysisThe burden of mental disorders is high in conflict-affected populations. Given the large numbers of people in need and the humanitarian imperative to reduce suffering, there is an urgent need to implement scalable mental health interventions to address this burden. Full-Text PDF Open AccessRisk of childhood psychiatric disorders in children of refugee parents with post-traumatic stress disorder: a nationwide, register-based, cohort studyChildren of refugees exposed to parental PTSD are at increased risk of psychiatric morbidity. Targeted screening and interventions are necessary to prevent psychiatric morbidity and ensure access to adequate care. Full-Text PDF Open Access

Research round-up

In a double-blind, randomised withdrawal study in patients with treatment-resistant depression, Daly and colleagues compared an oral antidepressant plus esketamine nasal spray with oral antidepressant plus placebo nasal spray for the prevention of relapse. Treatment (esketamine nasal spray 56 mg or 84 mg flexible dosing) was initiated in 455 patients. 176 achieved stable remission after 16 weeks and entered the randomised maintenance phase of the study (oral antidepressant plus continued treatment with nasal esketamine or withdrawal of nasal esketamine). 121 participants with stable response also entered the randomised study and were analysed for secondary endpoints. In the primary analysis of participants with stable remission, relapse occurred in 24 (27%) of 90 in the esketamine group and 39 (45%) of 86 in the placebo group experienced relapse (hazard ratio 0·49 [95% CI 0·29–0·84]; p=0·003; NNT=6). Prevalence of maternal mental illness among children and adolescents in the UK between 2005 and 2017: a national retrospective cohort analysisOne in four children aged 0–16 years are exposed to maternal mental illness and the prevalence of diagnosed and treated maternal mental illness is increasing. Policy makers and commissioners should consider this information and channel resources to target individuals in greatest need. Full-Text PDF Open AccessNew WHO prevalence estimates of mental disorders in conflict settings: a systematic review and meta-analysisThe burden of mental disorders is high in conflict-affected populations. Given the large numbers of people in need and the humanitarian imperative to reduce suffering, there is an urgent need to implement scalable mental health interventions to address this burden. Full-Text PDF Open Access

New WHO prevalence estimates of mental disorders in conflict settings: a systematic review and meta-analysis

SummaryBackgroundExisting WHO estimates of the prevalence of mental disorders in emergency settings are more than a decade old and do not reflect modern methods to gather existing data and derive estimates. We sought to update WHO estimates for the prevalence of mental disorders in conflict-affected settings and calculate the burden per 1000 population.MethodsIn this systematic review and meta-analysis, we updated a previous systematic review by searching MEDLINE (PubMed), PsycINFO, and Embase for studies published between Jan 1, 2000, and Aug 9, 2017, on the prevalence of depression, anxiety disorder, post-traumatic stress disorder, bipolar disorder, and schizophrenia. We also searched the grey literature, such as government reports, conference proceedings, and dissertations, to source additional data, and we searched datasets from existing literature reviews of the global prevalence of depression and anxiety and reference lists from the studies that were identified. We applied the Guidelines for Accurate and Transparent Health Estimates Reporting and used Bayesian meta-regression techniques that adjust for predictors of mental disorders to calculate new point prevalence estimates with 95% uncertainty intervals (UIs) in settings that had experienced conflict less than 10 years previously.FindingsWe estimated that the prevalence of mental disorders (depression, anxiety, post-traumatic stress disorder, bipolar disorder, and schizophrenia) was 22·1% (95% UI 18·8–25·7) at any point in time in the conflict-affected populations assessed. The mean comorbidity-adjusted, age-standardised point prevalence was 13·0% (95% UI 10·3–16·2) for mild forms of depression, anxiety, and post-traumatic stress disorder and 4·0% (95% UI 2·9–5·5) for moderate forms. The mean comorbidity-adjusted, age-standardised point prevalence for severe disorders (schizophrenia, bipolar disorder, severe depression, severe anxiety, and severe post-traumatic stress disorder) was 5·1% (95% UI 4·0–6·5). As only two studies provided epidemiological data for psychosis in conflict-affected populations, existing Global Burden of Disease Study estimates for schizophrenia and bipolar disorder were applied in these estimates for conflict-affected populations.InterpretationThe burden of mental disorders is high in conflict-affected populations. Given the large numbers of people in need and the humanitarian imperative to reduce suffering, there is an urgent need to implement scalable mental health interventions to address this burden.FundingWHO; Queensland Department of Health, Australia; and Bill & Melinda Gates Foundation.

Introducing ‘Young Minds Matter’

AbstractYoung Minds Matter: The second Australian Child and Adolescent Survey of Mental Health and Wellbeing provides updated national prevalence estimates of mental disorders in children and adolescents and measures the burden and impact of these disorders and the use of services and unmet need for services in the health and education sectors. The field work for Young Minds Matter included face‐to‐face interviews with the primary carer of 6,310 children and adolescents aged 4–17 years who were randomly selected from across Australia. This article describes the survey, the response rates achieved and the representativeness of the sample.

Prevalence and comorbidity of mental disorders among adolescents living in residential youth care.

Most adolescents are placed in residential youth care (RYC) because of severe psychosocial strains and child maltreatment, which represent risk factors for developing mental disorders. To plan RYC units and ensure that residents receive evidence-based psychiatric interventions, it is necessary to obtain reliable and valid prevalence estimates of mental disorders in this population. However, there is a lacuna of research on diagnoses derived from standardized clinical interviews. The aim of this study was to assess the prevalence and comorbidity of mental disorders applying diagnostic interviews in an entire population of adolescents living in RYC in Norway. All young people in RYC were invited to participate in the study. Eighty-six RYC institutions with 601 eligible adolescents were included and 400 adolescents, 12–20 years old, participated in the study, yielding a response rate of 67 %. Anonymous Child Behaviour Checklist scores for 141 (70 %) of the declining residents were also available, allowing diagnoses according to the Diagnostic and Statistical Manual of Mental Disorders Fourth Edition (DSM-IV) for 541 youths to be estimated. Diagnoses were assessed by trained interviewers with the Child and Adolescent Psychiatric Assessment interview (CAPA). Seventy-six point two per cent (71.5–80.8 CI 95 %) of adolescents received at least one 3-month DSM-IV diagnosis. Prevalence rates for internalizing psychiatric disorders were higher than for behavioural disorders. Comorbidity was high between these two groups. Mental disorders were prevalent among children and youth in RYC. Our results create major concerns and challenge the existing organization of the RYC system.

Prevalence and correlates of major depressive disorder and dysthymia in an eleven-year follow-up – Results from the Finnish Health 2011 Survey

BackgroundUp-to-date epidemiological data on depressive disorders is needed to understand changes in population health and health care utilization. This study aims to assess the prevalence of major depressive disorder (MDD) and dysthymia in the Finnish population and possible changes during the past 11 years. MethodsIn a nationally representative sample of Finns aged 30 and above (BRIF8901), depressive disorders were diagnosed with the Composite International Diagnostic Interview (M-CIDI) in 2000 and 2011. To account for nonresponse, two methods were compared: multiple imputation (MI) utilizing data from the hospital discharge register and from the interview in 2000 and statistical weighting. ResultsThe MI-corrected 12-month prevalence of MDD was 7.4% (95% CI 5.7–9.0) and of dysthymia was 4.5% (95% CI 3.1–5.9), whereas the corresponding figures using weights were 5.4% (95% CI 4.7–6.1) for MDD and 2.0% (95% CI 1.6–2.4) for dysthymia. Women (OR 2.33, 95% CI 1.6–3.4) and unmarried people (OR 1.54, 95% CI 1.2–2.0) had a higher risk of depressive disorders. There was a significant increase in the prevalence of depressive disorders during the follow-up period from 7.3% in 2000 to 9.6% in 2011. Prevalences were two percentage points higher, on average, when using MI compared to weighting. Hospital treatments for depressive disorders and other mental disorders were strongly associated with nonparticipation. LimitationsThe CIDI response rate dropped from 75% in 2000 to 57% in 2011, but this was accounted for by MI and weighting. ConclusionsDepressive disorders are a growing public health concern in Finland. Non-participation of persons with severe mental disorders may bias the prevalence estimates of mental disorders in population-based studies.

Four-week prevalence of mental disorders in patients with cancer across major tumor entities.

To provide the 4-week prevalence estimates of mental disorders in cancer populations. We enrolled adult patients with cancer from in- and outpatient care facilities, using a proportional stratified random sample based on the nationwide cancer incidence in Germany. Patients who scored 9 or above on the Patient Health Questionnaire (PHQ-9) were administered to the standardized computer-assisted Composite International Diagnostic Interview for mental disorders adapted for cancer patients (CIDI-O). A random sample of those with a PHQ-9 score that was less than 9 were selected for a CIDI-O. A total of 5,889 patients were identified, which led to 4,020 participants (a 68.3% response rate); of those, 2,141 patients were interviewed. The 4-week total prevalence for any mental disorder was 31.8% (95% CI, 29.8% to 33.8%); this included any anxiety disorder (11.5%; 95% CI, 10.2% to 12.9%), any adjustment disorder (11.1%; 95% CI, 9.7% to 12.4%), any mood disorder (6.5%; 95% CI, 5.5% to 7.5%), any somatoform/conversion disorder (5.3%; 95% CI, 4.3% to 6.2%), nicotine dependence (4.5%; 95% CI, 3.6% to 5.4%), alcohol abuse/dependence (0.3%; 95% CI, 0.1% to 0.6%), any mental disorder resulting from general medical condition (2.3%; 95% CI, 1.7% to 2.9%), and any eating disorder (0%). The highest prevalence for any mental disorder was found in patients with breast cancer (41.6%; 95% CI, 36.8% to 46.4%), followed by patients with head and neck cancer (40.8%; 95% CI, 28.5% to 53.0%). The lowest prevalence was found in patients with pancreatic cancer (20.3%; 95% CI, 8.9% to 31.6%) and stomach/esophagus cancers (21.2%; 95% CI, 12.8% to 29.6%). Our findings provide evidence for the strong need for psycho-oncological interventions.

Twelve-month prevalence, comorbidity and correlates of mental disorders in Germany: the Mental Health Module of the German Health Interview and Examination Survey for Adults (DEGS1-MH).

This paper provides up to date prevalence estimates of mental disorders in Germany derived from a national survey (German Health Interview and Examination Survey for Adults, Mental Health Module [DEGS1-MH]). A nationally representative sample (N = 5318) of the adult (18-79) population was examined by clinically trained interviewers with a modified version of the Composite International Diagnostic Interview (DEGS-CIDI) to assess symptoms, syndromes and diagnoses according to DSM-IV-TR (25 diagnoses covered). Of the participants 27.7% met criteria for at least one mental disorder during the past 12 months, among them 44% with more than one disorder and 22% with three or more diagnoses. Most frequent were anxiety (15.3%), mood (9.3%) and substance use disorders (5.7%). Overall rates for mental disorders were substantially higher in women (33% versus 22% in men), younger age group (18-34: 37% versus 20% in age group 65-79), when living without a partner (37% versus 26% with partnership) or with low (38%) versus high socio-economic status (22%). High degree of urbanization (> 500,000 inhabitants versus < 20,000) was associated with elevated rates of psychotic (5.2% versus 2.5%) and mood disorders (13.9% versus 7.8%). The findings confirm that almost one third of the general population is affected by mental disorders and inform about subsets in the population who are particularly affected.

Prevalence of Mental Disorders among Prisoners in the State of Sao Paulo, Brazil

ObjectiveTo determine the prevalence of psychiatric disorders in the prison population in the State of São Paulo, Brazil.MethodsThrough stratified random sampling, 1.192 men and 617 women prisoners were evaluated for the presence of psychiatric disorders by the Composite International Diagnostic Interview, 2.1 version, according to definitions and criteria of International Classification of Diseases (ICD-10). The prevalence estimates of mental disorders and their respective 95% confidence intervals were calculated and adjusted for sample design through complex sample analysis.ResultsLifetime and 12-month prevalence rates differed between genders. Lifetime and 12-month prevalence of any mental disorder was, respectively, 68.9% and 39.2% among women, and 56.1% and 22.1% among men. Lifetime and 12-month prevalence of anxious-phobic disorders was, respectively, 50% and 27.7% among women and 35.3% and 13.6% among men, of affective disorders was 40% and 21% among women and 20.8% and 9.9% among men, and of drug-related disorders was 25.2% and 1.6% among women and 26.5% and 1.3% among men. For severe mental disorders (psychotic, bipolar disorders, and severe depression), the lifetime and 12-month prevalence rates were, respectively, 25.8% and 14.7% among women, and 12.3% and 6.3% among men.ConclusionsThis is the first large-scale epidemiological study performed with the prison population in Brazil, revealed high rates of psychiatric disorders among men and women. Many similarities, as well as some differences, were found between our results and those of studies conducted in other countries. The differences observed are more likely due to the peculiarities of the prison systems in each country than to the diagnostic criteria adopted in the studies. This fact reinforces the importance of conducting such studies as part of planning and development of appropriate policies for the particular mental health needs of specific prison populations.

Lifetime Prevalence of Mental Disorders among Asian Americans: Nativity, Gender, and Sociodemographic Correlates.

This study examines lifetime prevalence estimates of mental disorders among Asian Americans with a focus on differences by nativity, gender, and other relevant sociodemographic correlates. We analyze cross-sectional data from the National Latino and Asian American Study (NLAAS), the first national epidemiological survey of Asian Americans which used a probability sample of household resident adults in the United States (N=2,095). US-born Asian Americans are more likely to experience lifetime mood disorders, substance use disorders, and any mental disorders compared to immigrants. Lifetime substance use disorders are more likely to occur among men rather than women. Nativity and gender show joint associations with different mental disorders: US-born women are at the greatest risk for any mood disorders; US-born men are at the greatest risk for any substance use disorders; and immigrant women are at the lowest risk for substance use disorders compared to all other groups. Analysis of the sociodemographic correlates reveals that the youngest immigrant women showed significantly higher rates of any mood disorder compared to other immigrant women. Additionally, among immigrant men, those with low household income are at a higher risk for mood disorders, and those who report fair/poor English proficiency have a higher prevalence of anxiety and mood disorders. This study provides documentation of prevalence differences in detailed mental health categories along salient axes of stratification among Asian Americans and provides a foundation for future research aimed at understanding the causes and correlates of mental health disparities.

2075 – Prevalence of mental disorders among prisoners in the state of São Paulo - Brazil

Epidemiological studies conducted with prisoners in several countries have shown a high prevalence of mental disorders. To determine the prevalence of psychiatric disorders in the prison population in the State of São Paulo, Brazil. Through stratified random sampling, 1,192 men and 617 women prisoners were evaluated for the presence of psychiatric disorders by the Composite International Diagnostic Interview, 2.1 version, according to definitions and criteria of International Classification of Diseases (ICD-10). The prevalence estimates of mental disorders and their respective 95% confidence intervals were calculated and adjusted for sample design through complex sample analysis. Lifetime and 12-month prevalence rates differed between genders. Lifetime and 12-month prevalence of any mental disorder was, respectively, 68.9% and 39.2% among women, and 56.1% and 22.1% among men. Lifetime and 12-month prevalence of anxious-phobic disorders was, respectively, 50% and 27.7% among women and 35.3% and 13.6% among men, of affective disorders was 40% and 21% among women and 20.8% and 9.9% among men, and of drug-related disorders was 25.2% and 1.6% among women and 26.5% and 1.3% among men. For severe mental disorders (psychotic, bipolar disorders, and severe depression), the lifetime and 12-month prevalence rates were, respectively, 25.8% and 14.7% among women, and 12.3% and 6.3% among men. This study, which was performed with a representative prison population, showed high rates of psychiatric disorders among men and women. Epidemiological studies on mental health needs of prisoners are crucial for planning and development of appropriate health care programs for specific prison populations.

Psychiatric epidemiological surveys in China 1960–2010: how real is the increase of mental disorders?

Community psychiatric epidemiological surveys over the last five decades have revealed a dramatic increase in the prevalence of mental disorders in China. This article summarizes the main surveys and attempts to interpret the increase of prevalence from a methodological perspective. Regional and national surveys conducted in China during 1960-1990 focused on severe mental disorders and revealed very low and stable rates of disorders. By contrast, those performed in the last decade, whether psychiatrists or lay interviewers were used, have shown much higher and more 'reliable' rates comparable to those found in high-income countries. This is especially so for depression and anxiety disorders. Given the sociopolitical turmoil that had previously plagued people in China, the dramatic rise in prevalence estimates of mental disorders in recent years cannot be simply interpreted as a substantive deterioration of mental health following rapid social change. Global and local factors that shape research methodology aimed at showing that mental disorders are common may play an important role in the dramatic increase. Future research in China should move beyond descriptive epidemiology. It should also address policy relevant issues in view of the limited resources available for mental health interventions.

The ESEMeD-WMH project: strenghtening epidemiological research in Europe through the study of variation in prevalence estimates

The European Study of the Epidemiology of Mental Disorders (ESEMeD) project is the first cross-national European survey to collect data on prevalence, risk factors, health-related quality of life and use of services associated with common mental disorders. Representative samples of the non-institutionalized populations of Belgium, France, Germany, Italy, the Netherlands and Spain were interviewed using the CIDI 3.0, totaling 21,425 adult individuals. There was important variation across countries in prevalence estimates of the disorders studied, with Belgium and France in the highest proportions and Italy and Spain the lowest. Comorbidity of mood and anxiety disorders was frequent in all countries. Use of services due to mental health is low in all European countries, but especially low in Italy. Remarkably, only about one in five participants with a mental disorder had consulted the health services in the prior year. We discuss about the possible explanations of cross-national differences in prevalence estimates of mental disorders, and some of the limitations of the data on alcohol abuse and dependence gathered in the study. We conclude that despite the advances in knowledge about determinants and treatment methods, the care of the mentally ill is rather limited in Europe.

The Relation between Perceived Need for Mental Health Treatment, DSM Diagnosis, and Quality of Life: A Canadian Population-Based Survey

Prevalence estimates of mental disorders were designed to provide an indirect estimate of the need for mental health services in the community. However, recent studies have demonstrated that meeting criteria for a DSM-based disorder does not necessarily equate with need for treatment. The current investigation examined the relation between self-perceived need for mental health treatment and DSM diagnosis, with respect to quality of life (QoL) and suicidal ideation. Data came from an Ontario population-based sample of 8116 residents (aged 15 to 64 years). The University of Michigan Composite International Diagnostic Interview was used to diagnose mood, anxiety, substance use, and bulimia disorder according to DSM-III-R criteria. We categorized past-year help seeking for emotional symptoms and (or) perceiving a need for treatment without seeking care as self-perceived need for treatment. We used a range of variables to measure QoL: self-perception of mental health status, a validated instrument that measured well-being, and restriction of activities (current, past 30 days, and long-term). Independent of subjects' meeting criteria for a DSM-III-R diagnosis, self-perceived need for treatment was significantly associated with poor QoL (on all measures) and past-year suicidal ideation. Self-perceived need for mental health treatment, in addition to DSM diagnosis, may provide valuable information for estimating the number of people in the population who need mental health services. The relation between self-perceived need for treatment and objective measures of treatment need requires future study.

New Data Reduce One-Year Mental Disorder Prevalence

New Data Reduce One-Year Mental Disorder Prevalence

Revised prevalence estimates of mental disorders in the United States: using a clinical significance criterion to reconcile 2 surveys' estimates.

Current US mental disorder prevalence estimates have limited usefulness for service planning and are often discrepant. Data on clinical significance from the National Institute of Mental Health Epidemiologic Catchment Area Program (ECA) and the National Comorbidity Survey (NCS) were used to produce revised estimates, for more accurate projections of treatment need and further explication of rate discrepancies. To ascertain the prevalence of clinically significant mental disorders in each survey, responses to questions on life interference from, telling a professional about, or using medication for symptoms were applied to cases meeting symptom criteria in the ECA (n = 20,861) and NCS (n = 8098). A revised national prevalence estimate was made by selecting the lower estimate of the 2 surveys for each diagnostic category, accounting for comorbidity, and combining categories. Using data on clinical significance lowered the past-year prevalence rates of "any disorder" among 18- to 54-year-olds by 17% in the ECA and 32% in the NCS. For adults older than 18 years, the revised estimate for any disorder was 18.5%. Using the clinical significance criterion reduced disparities between estimates in the 2 surveys. Validity of the criterion was supported by associations with disabilities and suicidal behavior. Establishing the clinical significance of disorders in the community is crucial for estimating treatment need. More work should be done in defining and operationalizing clinical significance, and characterizing the utility of clinically significant symptoms in determining treatment need even when some criteria of the disorder are not met. Discrepancies in ECA and NCS results are largely due to methodologic differences.